The USSR was able to mount those kinds of reactionary invasions, aimed at arresting the advance of workers' democracy, up until communism's advance threw up Poland's Solidarity to check their power. Communists in other places exercised a right to insurrection against oppressive government. And all those hostilites whether from communist revolutionaries or from pseudo-communist counterrevolutionaries pale next to the record of the U.S. which happened to be invading Cuba, Korea, China, and Laos in 1956, Cuba, Korea, China, Laos, Vietnam, Thailand, and Cambodia in 1968, and Cuba, Korea, and China in 1979 (not to mention CIA armed hostilities in Afghanistan, Nicaragua, Angola, and probably Mozambique and Cambodia).